Jeeze that is a profound question finally.

It is not just the tree that is sentient but the ecosystem. For example, the roots of the tree symbiotically communicate via fungal mycelium underground and air-born chemicals with other trees and insects.

Joe and I agree on less than Steve and me BUT we do share an agreement on features of Gaia. Gaia is a simple form of pan-psychism.

The sentience of living systems is by far greater than inanimate matter but it too may have very basic 'urges' we can not know.

On a personal level I understand some of the vocalizations of cats, crows and many other animals but sound is only one part of the spectrum of communication.